Freezer Model 4148 Temperature Control - Delfield McDonald's 400 Series Original User Manual

Freezer Model 4148 Temperature Control Operation
After the unit is connected to power it will automatically
begin operating. With the doors closed, the temperature of
the cabinet should reach 0°F (-18°C) on freezers in about
one hour.
A thermostat located in the evaporator housing on interior
rear of the unit, controls the temperature in the box.
The factory setting for the control is "4" and maintains
about -3°F (-18°C) in the box. Set toward "1" for higher
temperatures and toward "7" for lower temperatures.
Continuous opening and closing of the doors will hamper the
unit's ability to maintain optimum refrigeration temperature.
When the mechanical timer initiates a defrost cycle, power to
the condensing unit and evaporator fans is interrupted and
the defrost heater is energized. The defrost heater warms the
evaporator coil thereby melting all frost accumulated during
the previous refrigeration cycle. Once all frost is eliminated,
the temperature of the coil continues to rise until it reaches
27 minutes. The defrost control switches to refrigeration
mode. Defrost will initiate every six hours.
Turn the defrost timer screw ONLY in a
clockwise direction, turning the screw counter-
clockwise will break the cam motor.
Service Alert
During normal operation the evaporator fan may cycle
and/or pulse independently of the compressor. Consult
the service manual or contact Technical Support at
1-800-733-8829 if you are unsure of the proper function.
For factory assistance, call
888-436-5442
or 989-773-7981
Fax 888-779-2040
www.delfield.com
Delfield
™
®
Page 11